Why does 3toString () throw a syntax exception and does 3..toString () work fine?

Question

why in javascript 3.toString () throws an exception and 3..toString () works fine? I saw this in a funny presentation about javascript, but I can't find the information WHY. Thank you in advance.

Answer 1

Since the decimal point is the real part of the number, so the first point is considered to be numeric, the second for the chain.

If you prefer to avoid a double period, you can:

(3).toString();

Or:

'' + 3;

Or:

String(3);